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  1. #include <vector>
  2. #include <string>
  3. #include <iostream>
  4. #include <cstdio>
  5. #include <cstring>
  6.  
  7. struct User {
  8.     std::string name, game;
  9.     User(const char* nam, const char* gam) : name(nam), game(gam) {}
  10.     const char* getUsername() const {
  11.         return name.c_str();
  12.     }
  13. };
  14.  
  15. bool verify(char * a, std::vector<User> b) {
  16.     for (int i = 0; i < b.size(); i++) {
  17.         if (std::strcmp(a, b[i].getUsername()) == 0) {
  18.             return false;
  19.         }
  20.     }
  21.     return true;
  22. }
  23.  
  24. int main(){    
  25.     std::vector<User> users;
  26.  
  27.     User us1("foo", "bar");
  28.     users.push_back(us1);
  29.  
  30.     char username[100];
  31. 	bool first = true;
  32.  
  33.     do {
  34.     	if (!first) std::cout << username << ": no good!\n";
  35.         else first = false;
  36.         std::cout << "Enter Username: ";
  37.         std::scanf(" %50s", username);
  38.     } while(!verify(username, users));
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0s 3420KB
comments (?)
stdin 
foo
foo
foo
Greg
stdout 
Enter Username: foo: no good!
Enter Username: foo: no good!
Enter Username: foo: no good!
Enter Username:
https://ideone.com/Hpu7Dk
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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